ARP Aging

When the Layer 3 switch places an entry in the ARP cache, the Layer 3 switch also starts an aging timer for the entry. The aging timer ensures that the ARP cache does not retain learned entries that are no longer valid. An entry can become invalid when the device with the MAC address of the entry is no longer on the network.

The ARP age affects dynamic (learned) entries only, not static entries. The default ARP age is ten minutes. On Layer 3 switches, you can change the ARP age to a value from 0 through 240 minutes. If you set the ARP age to 0, aging is disabled and entries do not age out. You cannot change the ARP age on Layer 2 switches.

Note: Host devices connected to an ICX 7750 that also have a valid IP address and reply periodically to the ARP request are not timed out, even if no traffic is destined for the device. This behavior is restricted to only ICX 7750 devices.
Parent topic: ARP Parameter Configuration